6TR1 image
Entry Detail
PDB ID:
6TR1
Keywords:
Title:
Native cytochrome c6 from Thermosynechococcus elongatus in space group H3
Biological Source:
PDB Version:
Deposition Date:
2019-12-17
Release Date:
2019-12-25
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.20
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cytochrome c6
Chain IDs:A
Chain Length:86
Number of Molecules:1
Biological Source:Thermosynechococcus elongatus (strain BP-1)
Polymer Type:polypeptide(L)
Description:Cytochrome c6
Chain IDs:B (auth: C)
Chain Length:87
Number of Molecules:1
Biological Source:Thermosynechococcus elongatus (strain BP-1)
Polymer Type:polypeptide(L)
Description:Cytochrome c6
Chain IDs:C (auth: E)
Chain Length:86
Number of Molecules:1
Biological Source:Thermosynechococcus elongatus (strain BP-1)
Primary Citation
Crystal structures of native cytochrome c6from Thermosynechococcus elongatus in two different space groups and implications for its oligomerization.
Acta Crystallogr.,Sect.F 76 444 452 (2020)
PMID: 32880593 DOI: 10.1107/S2053230X20010249

Abstact

Native cytochrome c6 was purified from an extract of strain BP-1 of the thermophilic cyanobacterium Thermosynechococcus elongatus. The protein was crystallized, and with only slight modifications of the buffer and vapour-diffusion conditions two different space groups were observed, namely H3 and C2. Both crystal structures were solved; they contained three and six molecules per asymmetric unit and were refined to 1.7 and 2.25 Å resolution, respectively. To date, the structure of native cytochrome c6 from T. elongatus has only been reported as a monomer using NMR spectroscopy, i.e. without addressing putative oligomerization, and related structures have only previously been solved using X-ray crystallography after recombinant gene overexpression in Escherichia coli. The reported space groups of related cyanobacterial cytochrome c6 structures differ from those reported here. Interestingly, the protein-protein interfaces that were observed utilizing X-ray crystallography could also explain homo-oligomerization in solution; specifically, trimerization is indicated by infra-red dynamic light scattering and blue native gel electrophoresis in solution. Trimers were also detected by mass spectrometry. Furthermore, there is an indication of post-translational methylation in the crystal structure. Additionally, the possibility of modifying the crystal size and the redox activity in the context of photosynthesis is shaping the investigated cytochrome as a highly suitable model protein for advanced serial crystallography at highly brilliant X-ray free-electron laser sources.

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Primary Citation of related structures